Most likely, the main character is the girl. In stories that are named in such a way, the named entity is usually the one around whom the plot revolves. In this case, it's the girl on the train. She could be of any age, from a young girl to a young woman, and her actions, decisions, and experiences would be what drives the story forward in the context of the train journey.
Given the title 'girl on the train hindi story', it's safe to assume that the main character is the girl. She is the one on the train, so she is probably the one whose perspective we will see the story from. Her personality, her goals (if any) during the journey, and her reactions to the events that occur on the train will be what shapes the story. Whether she is a shy girl, an adventurous one, or a girl with a specific mission on the train is something that would be revealed as the story unfolds.
The main character has to be the girl on the train. The entire story seems to revolve around her. Whether she's traveling alone or with someone, whether she's going on a short or long journey, she is the central figure in this 'the girl on the train 2013 story'.
Since I don't know the exact story, I can't say for sure. But it's likely the girl who is on the train in 2021 is the main character.
Since it's called the 'girl on the train story', the main character is most likely the girl. She is the central figure around whom the story presumably revolves.
The main character is the girl. But we don't know much about her. She could be a young girl, maybe a student or a working - class woman. All we know is that she is on the train in 2021, and the story likely revolves around her actions, thoughts, and experiences while on that train journey.
The main character is the girl, of course. Since it's a 'girl on a train story', she is the central focus. She is the one whose experiences, actions, and thoughts are likely to drive the story forward.
It seems that Parineeti is the main character as the title mentions 'girl on the train parineeti story'.
As I don't know the story, I can't say for sure. But probably the girl herself is a main character. There might also be other passengers, the train conductor or some people she meets at the stations.
Since we don't know the exact story, it's likely the girl is one of the main characters as she is in the title. She is the one on the train and presumably involved with the situation regarding the dead woman.
I'm not sure specifically about this 'girl on the train hindi story' without more context. It could be about a girl's journey on a train, perhaps her experiences, the people she meets, or some sort of adventure that takes place during the train ride in a Hindi - speaking setting.
Since I don't know the exact story, the main character is surely the girl on the train. There might be other characters like the train conductor, or maybe some fellow passengers who play important roles in her story.